228278191853656 has 128 divisors (see below), whose sum is σ = 527833795092480. Its totient is φ = 90320862468096.

The previous prime is 228278191853651. The next prime is 228278191853683. The reversal of 228278191853656 is 656358191872822.

It is a super-2 number, since 2×228278191853656² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228278191853651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 223869141 + ... + 224886523.

It is an arithmetic number, because the mean of its divisors is an integer number (4123701524160).

Almost surely, 2^{228278191853656} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228278191853656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263916897546240).

228278191853656 is an abundant number, since it is smaller than the sum of its proper divisors (299555603238824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

228278191853656 is a wasteful number, since it uses less digits than its factorization.

228278191853656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021913 (or 1021909 counting only the distinct ones).

The product of its digits is 696729600, while the sum is 73.

The spelling of 228278191853656 in words is "two hundred twenty-eight trillion, two hundred seventy-eight billion, one hundred ninety-one million, eight hundred fifty-three thousand, six hundred fifty-six".